Large finite-difference time domain simulations of a left-handed metamaterial lens with wires and resonators

We present high-resolution computational results using large three-dimensional finite-difference time domain simulations of flat lenses made of left-handed metamaterial at microwave frequencies. These parallel computer simulations include all the details of the split-ring resonators, wires, and circuit boards that make up the metamaterial. The region of focusing is shown to be ∼0.5λ in radius and ∼-24 dB down in power from the source level. The best focusing with the least aberration and the highest power density occurs at the frequency of peak transmission or best impedance match, as opposed to the frequency where the index of refraction n=-1.